Is he cheating on her with me? Request: Should I accept it?

This guy, we've only been seeing each other for a week or two. He sent me a relationship request on Facebook, but the thing is it says he has a wife. I want to confront him about it and tell him I'm not going to accept it until he tells me what's going on with him and this other girl. He put the same anniversary day for both on the same day May 29.